David Fairbrother authored Nov 22, 2021 and Peterson, Peter committed Dec 02, 2021

- Refactor RedField to use a built in named constant
- Use numpy.power instead of **2

For the test we were using a tiny Gauss value. The original value was
0.1, for reference a Iron Bar Magnet has a value of 100G so naturally
we're going to get garbage back out.

Tweak the values in to be more sensible as they were falling off to 0
due to the 1/x^2 calculation